In Object-Oriented Programming, which of the following correctly demonstrates the concept of Aggregation?

Aggregation is a type of association where one class is associated with another class, but the associated objects can exist independently of the container object. In the case of a Department and Employee, the Employee objects can exist without being part of a particular Department, signifying aggregation. Aggregation allows for relationships where components can have independent lifecycles. Why Other Options Are Wrong : A) and C) represent Composition, where the Engine and Room objects cannot exist independently of the Car and House, respectively. D) is Composition because Books cannot exist without the Library. E) also reflects Composition since the CPU is an integral part of the Computer and cannot exist separately.